Why do I encounter: "TypeError: t(...).isPlaceholder is not a function" when "import './bootstrap/dist/css/bootstrap.min.css'"

Question

I installed bootstrap via npm install already and i tried to import it to my App.js file:

import './bootstrap/dist/css/bootstrap.min.css'

But then the app return this on the browser:

TypeError: t(...).isPlaceholder is not a function Could someone please explain why and how to fix? Thank you

Answer 1

For me, I saw these errors when I bumped @babel dependencies a few minor versions (several packages and plugins). What helped was removing the node_modules directory and then installing all the packages again.

1. Remove node_modules: rm -rf ./node_modules
2. Install packages yarn or npm i
3. Run your project again

Answer 2

I just encountered this error.

To fix it, make sure you're not mixing up your package managers. I was using yarn, but then used npm because that's what we use at work.

you should add or install your modules using the same package manager